The FSF are even stronger than the OSI on the point that people must also have the freedom to charge for the software if they want:
Many people believe that the spirit of the GNU Project
is that you should not charge money for distributing
copies of software, or that you should charge as little
as possible — just enough to cover the cost. This is a
misunderstanding. Actually, we encourage people who
redistribute free software to charge as much as they
wish or can.
